<template>
  <view
    class="uv-upload"
    :style="[$uv.addStyle(customStyle)]"
  >
    <view class="uv-upload__wrap">
      <template v-if="previewImage">
        <view
          class="uv-upload__wrap__preview"
          v-for="(item, index) in lists"
          :key="index"
        >
          <image
            v-if="item.isImage || (item.type && item.type === 'image')"
            :src="item.thumb || item.url"
            :mode="imageMode"
            class="uv-upload__wrap__preview__image"
            @tap="onPreviewImage(item, index)"
            :style="[{
              width: $uv.addUnit(width),
              height: $uv.addUnit(height)
            }]"
          />
          <view
            v-else
            class="uv-upload__wrap__preview__other"
            @tap="onPreviewVideo(item, index)"
            :style="[{
              width: $uv.addUnit(width),
              height: $uv.addUnit(height)
            }]"
          >
            <uv-icon
              color="#80CBF9"
              size="26"
              :name="item.isVideo || (item.type && item.type === 'video') ? 'movie' : 'folder'"
            ></uv-icon>
            <text class="uv-upload__wrap__preview__other__text">{{ item.isVideo || (item.type && item.type === 'video') ?
              '视频' : '文件' }}</text>
          </view>
          <view
            class="uv-upload__status"
            v-if="item.status === 'uploading' || item.status === 'failed'"
          >
            <view class="uv-upload__status__icon">
              <uv-icon
                v-if="item.status === 'failed'"
                name="close-circle"
                color="#ffffff"
                size="25"
              />
              <uv-loading-icon
                size="22"
                mode="circle"
                v-else
              />
            </view>
            <text
              v-if="item.message"
              class="uv-upload__status__message"
            >{{ item.message }}</text>
          </view>
          <view
            class="uv-upload__deletable"
            v-if="item.status !== 'uploading' && (deletable || item.deletable)"
            @tap.stop="deleteItem(index)"
          >
            <view class="uv-upload__deletable__icon">
              <uv-icon
                name="close"
                color="#ffffff"
                size="10"
              ></uv-icon>
            </view>
          </view>
          <view
            class="uv-upload__success"
            v-if="item.status === 'success'"
          >
            <!-- #ifdef APP-NVUE -->
            <image
              :src="successIcon"
              class="uv-upload__success__icon"
            ></image>
            <!-- #endif -->
            <!-- #ifndef APP-NVUE -->
            <view class="uv-upload__success__icon">
              <uv-icon
                name="checkmark"
                color="#ffffff"
                size="12"
              ></uv-icon>
            </view>
            <!-- #endif -->
          </view>
        </view>
      </template>
      <template v-if="isInCount">
        <view @tap="chooseFile">
          <slot>
            <view
              class="uv-upload__button"
              :hover-class="!disabled ? 'uv-upload__button--hover' : ''"
              hover-stay-time="150"
              @tap.stop="chooseFile"
              :class="[disabled && 'uv-upload__button--disabled']"
              :style="[{
                width: $uv.addUnit(width),
                height: $uv.addUnit(height)
              }]"
            >
              <uv-icon
                :name="uploadIcon"
                size="26"
                :color="uploadIconColor"
              ></uv-icon>
              <text
                v-if="uploadText"
                class="uv-upload__button__text"
              >{{ uploadText }}</text>
            </view>
          </slot>
        </view>
      </template>
    </view>
    <uv-preview-video ref="previewVideo"></uv-preview-video>
  </view>
</template>

<script>
import { func, image, video, array, promise } from '@/uni_modules/uv-ui-tools/libs/function/test.js';
import mpMixin from '@/uni_modules/uv-ui-tools/libs/mixin/mpMixin.js'
import mixin from '@/uni_modules/uv-ui-tools/libs/mixin/mixin.js'
import { chooseFile } from './utils';
import mixin_accept from './mixin.js';
import props from './props.js';
/**
 * upload 上传
 * @description 该组件用于上传图片场景
 * @tutorial https://www.uvui.cn/components/upload.html
 * @property {String}			accept				接受的文件类型, 可选值为all media image file video （默认 'image' ）
 * @property {String | Array}	capture				图片或视频拾取模式，当accept为image类型时设置capture可选额外camera可以直接调起摄像头（默认 ['album', 'camera'] ）
 * @property {Boolean}			compressed			当accept为video时生效，是否压缩视频，默认为true（默认 true ）
 * @property {String}			camera				当accept为video时生效，可选值为back或front（默认 'back' ）
 * @property {Number}			maxDuration			当accept为video时生效，拍摄视频最长拍摄时间，单位秒（默认 60 ）
 * @property {String}			uploadIcon			上传区域的图标，只能内置图标（默认 'camera-fill' ）
 * @property {String}			uploadIconColor		上传区域的图标的字体颜色，只能内置图标（默认 #D3D4D6 ）
 * @property {Boolean}			useBeforeRead		是否开启文件读取前事件（默认 false ）
 * @property {Boolean}			previewFullImage	是否开启图片预览功能（默认 true ）
 * @property {Boolean}			previewFullVideo	是否开启视频预览功能（默认 true ）
 * @property {String | Number}	maxCount			最大上传数量（默认 52 ）
 * @property {Boolean}			disabled			是否启用（默认 false ）
 * @property {String}			imageMode			预览上传的图片时的裁剪模式，和image组件mode属性一致（默认 'aspectFill' ）
 * @property {String}			name				标识符，可以在回调函数的第二项参数中获取
 * @property {Array}			sizeType			所选的图片的尺寸, 可选值为original compressed（默认 ['original', 'compressed'] ）
 * @property {Boolean}			multiple			是否开启图片多选，部分安卓机型不支持 （默认 false ）
 * @property {Boolean}			deletable			是否展示删除按钮（默认 true ）
 * @property {String | Number}	maxSize				文件大小限制，单位为byte （默认 Number.MAX_VALUE ）
 * @property {Array}			fileList			显示已上传的文件列表
 * @property {String}			uploadText			上传区域的提示文字
 * @property {String | Number}	width				内部预览图片区域和选择图片按钮的区域宽度（默认 80 ）
 * @property {String | Number}	height				内部预览图片区域和选择图片按钮的区域高度（默认 80 ）
 * @property {Object}			customStyle			组件的样式，对象形式
 * @event {Function} afterRead		读取后的处理函数
 * @event {Function} beforeRead		读取前的处理函数
 * @event {Function} oversize		文件超出大小限制
 * @event {Function} clickPreview	点击预览时触发
 * @event {Function} delete 		删除图片
 * @example <uv-upload :action="action" :fileList="fileList" ></uv-upload>
 */
export default {
  name: "uv-upload",
  // #ifdef VUE3
  emits: ['error', 'beforeRead', 'oversize', 'afterRead', 'delete', 'clickPreview'],
  // #endif
  mixins: [mpMixin, mixin, mixin_accept, props],
  data() {
    return {
      // #ifdef APP-NVUE
      successIcon: '',
      // #endif
      lists: [],
      isInCount: true,
    }
  },
  watch: {
    // 监听文件列表的变化，重新整理内部数据
    fileList: {
      deep: true,
      immediate: true,
      handler() {
        this.formatFileList()
      }
    },
  },
  methods: {
    formatFileList() {
      const {
        fileList = [], maxCount
      } = this;
      const lists = fileList.map((item) =>
        Object.assign(Object.assign({}, item), {
          // 如果item.url为本地选择的blob文件的话，无法判断其为video还是image，此处优先通过accept做判断处理
          isImage: this.accept === 'image' || image(item.url || item.thumb),
          isVideo: this.accept === 'video' || video(item.url || item.thumb),
          deletable: typeof (item.deletable) === 'boolean' ? item.deletable : this.deletable,
        })
      );
      this.lists = lists
      this.isInCount = lists.length < maxCount
    },
    chooseFile() {
      this.timer && clearTimeout(this.timer);
      this.timer = setTimeout(() => {
        const {
          maxCount,
          multiple,
          lists,
          disabled
        } = this;
        if (disabled) return;
        // 如果用户传入的是字符串，需要格式化成数组
        let capture;
        try {
          capture = array(this.capture) ? this.capture : this.capture.split(',');
        } catch (e) {
          capture = [];
        }
        chooseFile(
          Object.assign({
            accept: this.accept,
            multiple: this.multiple,
            capture: capture,
            compressed: this.compressed,
            maxDuration: this.maxDuration,
            sizeType: this.sizeType,
            camera: this.camera,
          }, {
            maxCount: maxCount - lists.length,
          })
        )
          .then((res) => {
            this.onBeforeRead(multiple ? res : res[0]);
          })
          .catch((error) => {
            this.$emit('error', error);
          });
      }, 100)
    },
    // 文件读取之前
    onBeforeRead(file) {
      const {
        beforeRead,
        useBeforeRead,
      } = this;
      let res = true
      // beforeRead是否为一个方法
      if (func(beforeRead)) {
        // 如果用户定义了此方法，则去执行此方法，并传入读取的文件回调
        res = beforeRead(file, this.getDetail());
      }
      if (useBeforeRead) {
        res = new Promise((resolve, reject) => {
          this.$emit(
            'beforeRead',
            Object.assign(Object.assign({
              file
            }, this.getDetail()), {
              callback: (ok) => {
                ok ? resolve() : reject();
              },
            })
          );
        });
      }
      if (!res) {
        return;
      }
      if (promise(res)) {
        res.then((data) => this.onAfterRead(data || file));
      } else {
        this.onAfterRead(file);
      }
    },
    getDetail(index) {
      return {
        name: this.name,
        index: index == null ? this.fileList.length : index,
      };
    },
    onAfterRead(file) {
      const {
        maxSize,
        afterRead
      } = this;
      const oversize = Array.isArray(file) ?
        file.some((item) => item.size > maxSize) :
        file.size > maxSize;
      if (oversize) {
        this.$emit('oversize', Object.assign({
          file
        }, this.getDetail()));
        return;
      }
      if (typeof afterRead === 'function') {
        afterRead(file, this.getDetail());
      }
      this.$emit('afterRead', Object.assign({
        file
      }, this.getDetail()));
    },
    deleteItem(index) {
      this.$emit(
        'delete',
        Object.assign(Object.assign({}, this.getDetail(index)), {
          file: this.fileList[index],
        })
      );
    },
    // 预览图片
    onPreviewImage(item, index) {
      const lists = this.$uv.deepClone(this.lists);
      lists.map((i, j) => {
        if (j == index) {
          i.current = true;
        }
      });
      const filters = lists.filter(i => i.isImage);
      const findIndex = filters.findIndex(i => i.current);
      this.onClickPreview(item, index);
      if (!item.isImage || !this.previewFullImage) return
      uni.previewImage({
        // 先filter找出为图片的item，再返回filter结果中的图片url
        urls: this.lists.filter((item) => this.accept === 'image' || image(item.url || item.thumb)).map((item) => item.url || item.thumb),
        current: findIndex,
        fail() {
          this.$uv.toast('预览图片失败')
        },
      });
    },
    onPreviewVideo(item, index) {
      this.onClickPreview(item, index);
      if (!this.previewFullVideo || !item.isVideo) return;
      this.$refs.previewVideo.open(item.url);
    },
    onClickPreview(item, index) {
      this.$emit(
        'clickPreview',
        Object.assign(Object.assign({}, item), this.getDetail(index))
      );
    }
  }
}
</script>

<style lang="scss" scoped>
@import '@/uni_modules/uv-ui-tools/libs/css/components.scss';
@import '@/uni_modules/uv-ui-tools/libs/css/color.scss';
$uv-upload-preview-border-radius: 2px !default;
$uv-upload-preview-margin: 0 8px 8px 0 !default;
$uv-upload-image-width: 80px !default;
$uv-upload-image-height: $uv-upload-image-width;
$uv-upload-other-bgColor: rgb(242, 242, 242) !default;
$uv-upload-other-flex: 1 !default;
$uv-upload-text-font-size: 11px !default;
$uv-upload-text-color: $uv-tips-color !default;
$uv-upload-text-margin-top: 2px !default;
$uv-upload-deletable-right: 0 !default;
$uv-upload-deletable-top: 0 !default;
$uv-upload-deletable-bgColor: rgb(55, 55, 55) !default;
$uv-upload-deletable-height: 14px !default;
$uv-upload-deletable-width: $uv-upload-deletable-height;
$uv-upload-deletable-boder-bottom-left-radius: 100px !default;
$uv-upload-deletable-zIndex: 3 !default;
$uv-upload-success-bottom: 0 !default;
$uv-upload-success-right: 0 !default;
$uv-upload-success-border-style: solid !default;
$uv-upload-success-border-top-color: transparent !default;
$uv-upload-success-border-left-color: transparent !default;
$uv-upload-success-border-bottom-color: $uv-success !default;
$uv-upload-success-border-right-color: $uv-upload-success-border-bottom-color;
$uv-upload-success-border-width: 9px !default;
$uv-upload-icon-top: 0px !default;
$uv-upload-icon-right: 0px !default;
$uv-upload-icon-h5-top: 1px !default;
$uv-upload-icon-h5-right: 0 !default;
$uv-upload-icon-width: 16px !default;
$uv-upload-icon-height: $uv-upload-icon-width;
$uv-upload-success-icon-bottom: -10px !default;
$uv-upload-success-icon-right: -10px !default;
$uv-upload-status-right: 0 !default;
$uv-upload-status-left: 0 !default;
$uv-upload-status-bottom: 0 !default;
$uv-upload-status-top: 0 !default;
$uv-upload-status-bgColor: rgba(0, 0, 0, 0.5) !default;
$uv-upload-status-icon-Zindex: 1 !default;
$uv-upload-message-font-size: 12px !default;
$uv-upload-message-color: #FFFFFF !default;
$uv-upload-message-margin-top: 5px !default;
$uv-upload-button-width: 80px !default;
$uv-upload-button-height: $uv-upload-button-width;
$uv-upload-button-bgColor: rgb(244, 245, 247) !default;
$uv-upload-button-border-radius: 2px !default;
$uv-upload-botton-margin: 0 8px 8px 0 !default;
$uv-upload-text-font-size: 11px !default;
$uv-upload-text-color: $uv-tips-color !default;
$uv-upload-text-margin-top: 2px !default;
$uv-upload-hover-bgColor: rgb(230, 231, 233) !default;
$uv-upload-disabled-opacity: .5 !default;

.uv-upload {
  @include flex(column);
  flex: 1;

  &__wrap {
    @include flex;
    flex-wrap: wrap;
    flex: 1;

    &__preview {
      border-radius: $uv-upload-preview-border-radius;
      margin: $uv-upload-preview-margin;
      position: relative;
      overflow: hidden;
      @include flex;

      &__image {
        width: $uv-upload-image-width;
        height: $uv-upload-image-height;
      }

      &__other {
        width: $uv-upload-image-width;
        height: $uv-upload-image-height;
        background-color: $uv-upload-other-bgColor;
        flex: $uv-upload-other-flex;
        @include flex(column);
        justify-content: center;
        align-items: center;

        &__text {
          font-size: $uv-upload-text-font-size;
          color: $uv-upload-text-color;
          margin-top: $uv-upload-text-margin-top;
        }
      }
    }
  }

  &__deletable {
    position: absolute;
    top: $uv-upload-deletable-top;
    right: $uv-upload-deletable-right;
    background-color: $uv-upload-deletable-bgColor;
    height: $uv-upload-deletable-height;
    width: $uv-upload-deletable-width;
    @include flex;
    border-bottom-left-radius: $uv-upload-deletable-boder-bottom-left-radius;
    align-items: center;
    justify-content: center;
    z-index: $uv-upload-deletable-zIndex;

    &__icon {
      position: absolute;
      transform: scale(0.7);
      top: $uv-upload-icon-top;
      right: $uv-upload-icon-right;
      /* #ifdef H5 */
      top: $uv-upload-icon-h5-top;
      right: $uv-upload-icon-h5-right;
      /* #endif */
    }
  }

  &__success {
    position: absolute;
    bottom: $uv-upload-success-bottom;
    right: $uv-upload-success-right;
    @include flex;
    // 由于weex(nvue)为阿里巴巴的KPI(部门业绩考核)的laji产物，不支持css绘制三角形
    // 所以在nvue下使用图片，非nvue下使用css实现
    /* #ifndef APP-NVUE */
    border-style: $uv-upload-success-border-style;
    border-top-color: $uv-upload-success-border-top-color;
    border-left-color: $uv-upload-success-border-left-color;
    border-bottom-color: $uv-upload-success-border-bottom-color;
    border-right-color: $uv-upload-success-border-right-color;
    border-width: $uv-upload-success-border-width;
    align-items: center;
    justify-content: center;

    /* #endif */
    &__icon {
      /* #ifndef APP-NVUE */
      position: absolute;
      transform: scale(0.7);
      bottom: $uv-upload-success-icon-bottom;
      right: $uv-upload-success-icon-right;
      /* #endif */
      /* #ifdef APP-NVUE */
      width: $uv-upload-icon-width;
      height: $uv-upload-icon-height;
      /* #endif */
    }
  }

  &__status {
    position: absolute;
    top: $uv-upload-status-top;
    bottom: $uv-upload-status-bottom;
    left: $uv-upload-status-left;
    right: $uv-upload-status-right;
    background-color: $uv-upload-status-bgColor;
    @include flex(column);
    align-items: center;
    justify-content: center;

    &__icon {
      position: relative;
      z-index: $uv-upload-status-icon-Zindex;
    }

    &__message {
      font-size: $uv-upload-message-font-size;
      color: $uv-upload-message-color;
      margin-top: $uv-upload-message-margin-top;
    }
  }

  &__button {
    @include flex(column);
    align-items: center;
    justify-content: center;
    width: $uv-upload-button-width;
    height: $uv-upload-button-height;
    background-color: $uv-upload-button-bgColor;
    border-radius: $uv-upload-button-border-radius;
    margin: $uv-upload-botton-margin;
    /* #ifndef APP-NVUE */
    box-sizing: border-box;

    /* #endif */
    &__text {
      font-size: $uv-upload-text-font-size;
      color: $uv-upload-text-color;
      margin-top: $uv-upload-text-margin-top;
    }

    &--hover {
      background-color: $uv-upload-hover-bgColor;
    }

    &--disabled {
      opacity: $uv-upload-disabled-opacity;
    }
  }
}
</style>
